API: remove _normalize_object_id
API: remove _normalize_object_id

We should never get ObjectId objects through the public facing
functions.

tacaswell/metadataStore,arkilic/metadatastore,ericdill/databroker,hhslepicka/metadatastore,hhslepicka/metadatastore,NSLS-II/metadatastore,tacaswell/metadataStore,NSLS-II/metadatastore,ericdill/databroker,arkilic/metadatastore